Estimate Naegele’s due date as last menstrual period plus 280 days, plus days since LMP.
| Estimated due date | – |
| Days since LMP | – |
Use this calculator for the calendar sketch EDD = first day of last menstrual period + 280 days. Days since LMP are counted to today’s date. Dating scans beat the calendar. IVF-transfer and conception-date pages start from a different constant and are not here. This is not a diagnosis of viability.
Last period (first day): First day of the last menstrual period (YYYY-MM-DD).
Estimated due date: LMP + 280 days.
Days since LMP: Calendar days from LMP to today.
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